Specifications
SPECIFICATIONS:
Hardware Required: Cards can be installed only in MicroRacks.
Cable Required: For modem-to-modem line: Four-wire unconditioned twisted-pair, 19 to 26 AWG.
Interfaces: Serial: EIA/TIA-561 (compatible with EIA RS-232 and ITU-TSS [CCITT] V.24;
Line: Four-wire telco.
Internal: Card-edge for module--MicroRack interconnection.
Protocol: Asynchronous
Data Format: Transparent to numbers of data bits and stop bits and types of parity.
Flow Control: Transparent to all types of software (X-ON/X-OFF, robust X-ON/X-OFF, etc.) flow control;
DOES NOT support hardware (RTS/CTS, DTR/DSR, etc.) flow control.
Operating Mode: Full-Duplex.
Data Rates: Transparent to all data rates up to 19,200 bps
Transmit Level: 6 dBm.
Maximum Distance: See Distance Chart on page 5
Isolation: 1500 volts RMS minimum using custom transformers.
Surge-Response Time: 1psec.
Maximum Surge Protection: 600 watts dissipated after 1 msec.
User Controls: (5) Jumpers on interface module:
(2) Connect/disconnect Line A or B shield to/from Frame Ground;
(1) Connect/disconnect Signal Ground to/from Frame Ground;
(2) DSR tracks DTR (can not be set differently).
Indicators: (9) Front-panel LED's:
(1) Power;
(2) each for TD A and RD A
(2) each for TD B and RD B.
Connectors: On main module:
(1) 50-position card-edge male (to MicroRack);
On interface module:
(1) 50-position card-edge male (to MicroRack);
(2) 10-pin RJ female for modem-to-DTE lines;
(2) RJ-45 female for modem-to-modem lines.
Power: From MicroRack's power supply.
Input: 120 VAC or 240 VAC (user-selectable);
Output:: 10 VAC;
Consumption: 700 mW typical.
Fuse: On MicroRack:
400 mA when power supply is set to 120-VAC;
200 mA when power supply is set to 240-VAC.
INTRODUCTION:
The Mini Driver Card is a dual rack card (it has a main [front] module and an interface [rear] module) incorporating two short-range modems. Pairs
of these Cards make communication between buildings safer, because custom-designed ferrite-core transformers give the Cards DC isolation. The
Mini Driver Card operates full duplex, at data rates up to 19,200 bps, over two twisted pairs. Maximum distances are up to 10 miles (16.1 km) at 1,200
bps and up to 2.5 miles (4 km) at 19,200 bps. The Card also incorporates Silicon Avalanche Diodes for protection against the damaging effects of
nearby lightning strikes and other harmful transients.
The Mini Driver Card is fabricated using the latest surface-mount technology, so you get high-quality short-range-modem performance on a
convenient rack card. The Card is available with RJ-45 line-interface connectors on its interface (rear) module. It fills one function-card slot in our
MicroRacks (RM202, RM204, RM208, or RM216).
CONFIGURATION:
The Mini Driver Card is designed to be easy to use. There are no internal jumpers or DIP switches to set on the main (front) module of the Card.
However, you may have to configure the jumpers on the interface (rear) module that you have selected. This chapter describes these jumpers and
how to set them.
The Mini Driver Interface Card has two RJ-45 line-interface ports and two 10-pin RJ-style serial-interface ports as shown on page 1. Before you
install the Card, you should examine the interface module you have selected and make sure that it is configured for your application. Each interface
module is configured by setting jumpers ("straps") on its circuit board, as described in the rest of this section.
Setting the Configuration Jumpers:
The figure on page 1, shows the locations of the jumpers on the interface module. These jumpers determine various grounding and signal
characteristics for the serial and modem-to-modem lines. The table below, provides a summary of jumper functions. The functions are described in
more detail afterward.
Line Interface: Line A Shield and Line B Shield (JB2 and JB4):
These jumpers apply to the line interface. When one of these jumpers is in positions 1 and 2, it links RJ-45 Pins 2 and 7 on the
corresponding line to the interface module's frame ground. (If you are using shielded twisted-pair cable, the shield can be connected to these
pins.) In positions 2 and 3, Pins 2 and 7 remain connected to each other, but are disconnected ("lifted") from frame ground.
JB2:
Positions 1 and 2 = Line A Shield Connected
Positions 2 and 3 = No Shield (default)
JB4:
Positions 1 and 2 = Line B Shield Connected
Positions 2 and 3 = No Shield (default)
CAUTION:
If you connect shield to frame ground, make sure that Pins 2 and 7, as
well as the cable shield, are connected to ground at one end of the cable
only. Connecting them at both ends of the cable will defeat the transformer
isolation and will leave your system open to damage from ground loops.
JUMPER IN POSITIONS 1 AND 2 IN POSITIONS 2 AND 3
JB2
JB2
JB2
JB2
JB2
Line A Shield No Shield*
Line B Shield No Shield*
SGND tied to FGND SGND not tied to FGND*
DSR A tracks DTR* N/A
DSR B tracks DTR* N/A
* factory-default settings